Malicious PDF — malware analysis report

Static analysis result for SHA-256 957c99d71241d79a…

MALICIOUS

PDF

36.3 KB Created: 2021-06-29 16:47:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 66c9683fbef569994903540e20299544 SHA-1: 32c4f44b54b461ec3b9b7b551e364cf6b352311c SHA-256: 957c99d71241d79a29a01cc80fd53391b33bf3eebe779848a61c6b4e607f1480
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links disguised as promotions for free Robux and game hacks, which are known lures for malicious redirects. The heuristic firings confirm these links point to malicious redirector infrastructure. While no scripts were extracted, the embedded links and the document body's deceptive content strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.co/app/431946152/free-robux-promotions-game-hack In PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/easy-robux-today_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/get-more-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/free-robux-promo-codes-2021-not-expired-november_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/roblox-premium-free_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/how-to-change-your-username-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/roblox-hack-how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/coin-master-new-link-free-spin_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/robuxglobalcom-no-verification_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/free-us-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/free-spin-links-coin-master-october-30-2021_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/hack-roblox-users-free_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3733 22152 bytes
SHA-256: 5b118811463bc58c40f030b7d9b8c432e508a10deacf27c2eda2c6f2a11be386
font_01_sfnt_off0000684f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x684F 19356 bytes
SHA-256: e3a281b27907b847a3ed6508ee0483e35a17a46e4ac39821756ece55575d2596

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